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AMERICAN EMBASSY TUNISIA, INDUSTRIAL OUTLOOK REPORT, 6/9/80.BOYCE, R.L., THE TUNISIAN PHOSPHATE INDUSTRY: TRIP REPORTMARCH 21, 1980BRITISH SULPHUR CORP. LTD., WORLD SURVEY OF PHOSPHATEDEPOSITS, FOURTH EDITION, 1980CAPE, J.J., DEPOSIT EVALUATION, 1981COMPANIE DES PHOSPHATES DE GAFSA, FIVE YEAR PLAN, TABLES FORYEARS 1978 THROUGH 1984DEVOTO, R.H., AND D.N. STEVENS, URANIFEROUS PHOSPHATEDEPOSITS AND TECHNOLOGY AND ECONOMICS OF URANIUMRECOVERY FROM PHOSPHATE RESOURCES, UNITED STATES ANDFREE WORLD, VOL. 1, JUNE 1979INTERNATIONAL GEOLOGICAL CONGRESS, 14TH, LES RESERVESMONDIALES EN PHOSPHATES, 2 VOLUMES, 1926KHAMMOUMA, S., LETTER TO W.F. STOWASSER, JULY 16, 1979LEWIS, ROBERT S., ELEMENTS OF MINING, NEW YORK: JOHN WILEYAND SONS, INC., 1950SRI INTERNATIONAL, CHEMICAL ECONOMICS HANDBOOK, PHOSPHATEROCK, MARCH 1980STOWASSER, W.F., FIELD TRIP REPORT--TUNISIAN PHOSPHATE ROCKMINING INDUSTRY, NOV. 24, 1976STOWASSER, W.F., MEMORANDUM: FIELD TRIP TO PHOSPHATEPRODUCING MINES IN TUNISIA, DEC. 18, 1979TUNISIA BANKS ON NEW TECHNOLOGY ... P205 PRODUCTION GOALSENGINEERING AND MINING JOURNAL, SEPT. 1980.TUNISIA ... PLANT TO DOUBLE PHOSPHATE PRODUCTION ...,ENGINEERING AND MINING JOURNAL, MAY 1976.U.S. GEOLOGICAL SURVEY. MRDS, MINERAL RESOURCE DATA SYSTEM.U.S. GEOLOGICAL SURVEY. MAS, MINERALS AVAILABILITY SYSTEM.SAINFELD, PAUL. THE LEAD-ZINC BEARING DEPOSITS OF TUNISIA.ECONOMIC GEOLOGY. 1956. PP. 150-177.INDUSTRIAL MINERALS, JULY 1986, PP.20-27.